Type-writing machine.



Patented Jan 25, 1910.

(gm/L4? WM 117 TOR/YE) UNITED STATES PATENT OFFICE.

LEWIS C. MYERS, OF BROOKLYN, NEW YORK, ASSIGNOR TO ROYAL TYPEWRITERCOMPANY, OF NEW YORK, N. Y., A CORPORATION OF NEW JERSEY.

TYPE-WRITING MACHINE.

To all whom it may concern:

Be it known that I, LEWIS C. MYnns, a citizen of the United States ofAmerica, and a resident of the borough of Brooklyn, in the county ofKings, State of New York, have invented certain Improvements inType-lVriting Machines, of whichthe following is a specification.

Typewriting machines in recent years have been provided usually, if notuniversally, with a back check or stop applied to the escapeinent wheel.Its function is to check back-rotation of the escape wheel when thecarriage rack is moved from left to right in return of the carriage toinitial position. Such back checks, however, have to be adjusted withthe utmost nicety in adaptation to the machine to permit of the use ofracks varying pitch adapted to the use of varying type such as elite,pica English etc. Difficulties of adjustment also arise when the lead ordrop of the eseapement is changed. For these and other reasons, it ishighly desirable to dispense with the use of the back check.

Line lock devices are generally used in modern typewriting machines; andunless the escape wheel is controlled by the back check, it happens thatwhen the last letter permitted to be printed by the line lock devices isprinted, the usual drive pawl of the escape wheel will operate toadvance the escape wheel one step beyond that it should occupy.Consequently, when the carriage is returned to initial position for thecommencement of a new line, it will be one letter space out of positionwith reference to the scale; that is to say, if the margin is set at 10,when the carriage is returned until the pointer indicates 10, it will befound that the first letter of th new line will be printed in the letterspace 11,-@I. 6. one

' space to the right of the left hand margin of the printed matter. Thepointer has therefore been set one letter space out of position withreference to the scale so that the scale and pointer will not forman'accurate guide for the correction of errors or the in- Specificationof Letters Patent.

Application filed April 16, 1909.

Patented Jan. 25,1910.

Serial No. 490,245.

elimination of the escapement wheel back check and provides a means forsetting the movable or carriage stop away from the center or frame stopa distance corresponding with one letter space in excess of the distanceat which the carriage stop is always set in the ordinary operation ofthe machine. Of course, an operator might if she always remembered, setthe movable stop such distance away from the center stop but that wouldrequire constant attention on her part and subject her to the annoyanceand delay of making the adjustment. Such a plan would, therefore beimpracticable in a commercial machine.

This invention therefore comprises a gage applied to the margin stopdevices in such way that its front or leading edge is in advance of thestop surface of the margin stop. Therefore, when the margin stop is setup to the center stop such edge of the gage (which may be normally inoperative position and be capable of yielding). contacting with thecenter stop determines that the stop surface or movable stop shall beset one letter space farther away from the center stop than it wouldotherwise be. This gage may be in the form of a yielding bell cranklever pivoted on the top of the frame of the movable or carriage stop,and have applied to it a reaction spring of such tension as that" thegage may yield in the operation of the machine so that the carriage willbe finally arwhen adjustment of the movable stop is completed and it isreleased by the operator, the gage would be returned by its spring (orby gravity) to its normal position out of the path of the center stop.This latter form of the device is not specifically claimed by me sinceit is a specific form, of my generic invention, invented by Mr. EdwardB. Hess.

As an illustration of a typewriting machine to which my invention may beapplied,

reference is made to Patent No. 875,430

' well known in the market.

In the accompanying drawing: Figure 1',

is a side elevation showing a portion of a carriage stop rack, and amovable carriage stop with a gage thereon: Fig. 2, an end view showingthe rat: in cross section: Fig. 3, a View similar to Fig. 1 showing,however, the center or frame stop and also showing the latch of theadjustable stop disenga ed from the rack sothat the stop can be adjustedthereon: Fig. at, a plan view showing the movable stop with the gageplate adjusted to the center stop: and Fig. 5, a similar view showinghow the gage plate has yielded in the'operation of the machine to permitthe stop surface of the adjustable stop to contact with the center stop.

a is the ordinary carriage stop rack; 12 the frame of the adjugtablecarriage stop; 0 the handle or finger piece of the spring latch dpivoted at f on the frame 6 and which may be disengaged from the notchesin the rack to permit.movement of the stop back and forth thereon; and eis the stop surface of the carriage stop. Pivoted. at 9 upon the upperface of the latch (Z is a rocking elbow lever gage plate 1 l- One arm 2'of the plate projects so as to contact with the center stop j. The pin70, holds the gage plate in normal position against the reaction of itsspring at which is connected to an extension of the gage plate and to aprojection n from the edge of the latch.

I am aware, of course, that my invention may be embodied in a variety offorms which may be readily devised by those skilled in the art, and thatthe gage instead of being mounted on the movable margin stop may beappropriately designed and mounted on the center or frame stop. so thatin adjustment of the carriage stop the rigid surface 6 of the marginstop may in adjusting the stop be broughtinto contact with it.

. As the center and margin stops are removed an excess distance one fromthe other when the carnage is returned to 1n1t1al position, 1t enables awider margin for the resetting operation should the carriage be returnedslowly or violently. This is inherent in the operation of the inventionand is an added advantage to the machine.

I claim:

1. Margin stop devices comprising a fixed and a movable 'stop and a gagefor automatically setting the stop surfaces a distance away from" eachother equal to one letter space.

2. Margin stop devices comprising a fixed and a movable stop and a gagemounted on the movable stop for setting the stop surfaces a distanceaway from each other equal to one letter space.

3. Margin stop devices comprising a fixed and a movable stop and ayielding gage for setting the stop surfaces a distance away from eachother equal to one letter space.

4:. Margin stop devices comprising a fixed and a movable stop and ayielding gage nor mally in operative position for setting the stopsurfaces at distance away from each other equal to one letter space.

5. lvIargin stop devices comprising a fixed and a movable stop, apivoted gage plate mounted on the movable stop, a spring for normallyholding it in position to contact with the center stop to facilitatesetting the stop surface of the movable stop a distance of one letterspace away from the center stop,-the spring being adapted to yield andpermit the gage to yield in operation of the machine until the centerstop and the stop surface of the movable stop engage.

G. Margin stop devices comprising a fixed and a movable stop and a stopacting as a gage for setting the stop surfaces a distance away from eachother.

7. Margin stop devices comprising a fixed and a movable stop and a gagefor automatically setting the stop surfaces a distance away from eachother.

8. Margin stop devices comprising a fixed and a movable stop and ayielding gagefor setting the stop surfaces a distance away from eachother.

In testimony whereof, I have hereunto subscribed my name.

LEWIS G. MYERS. Witnesses:

E. B. Hess, A. J. SHERIDAN.

